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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/mapping-type-field.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/mapping-type-field.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/mapping-type-field.html" rel="nofollow" target="_blank">../en/mapping-type-field.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-node"><code class="literal">_type</code> field</span>
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<h2 class="title">
<a id="mapping-type-field"></a><code class="literal">_type</code> field<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/mapping/fields/type-field.asciidoc">edit</a>
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<h3>Deprecated in 6.0.0.</h3>
<p>See <a class="xref" href="removal-of-types.html" title="Removal of mapping types"><em>Removal of mapping types</em></a></p>
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<p>Each document indexed is associated with a <a class="xref" href="mapping-type-field.html" title="_type field"><code class="literal">_type</code></a> and
an <a class="xref" href="mapping-id-field.html" title="_id field"><code class="literal">_id</code></a>.  The <code class="literal">_type</code> field is indexed in order to make
searching by type name fast.</p>
<p>The value of the <code class="literal">_type</code> field is accessible in queries, aggregations,
scripts, and when sorting:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console"># Example documents

PUT my_index/_doc/1?refresh=true
{
  "text": "Document with type 'doc'"
}

GET my_index/_search
{
  "query": {
    "term": {
      "_type": "_doc"  <a id="CO331-1"></a><i class="conum" data-value="1"></i>
    }
  },
  "aggs": {
    "types": {
      "terms": {
        "field": "_type", <a id="CO331-2"></a><i class="conum" data-value="2"></i>
        "size": 10
      }
    }
  },
  "sort": [
    {
      "_type": { <a id="CO331-3"></a><i class="conum" data-value="3"></i>
        "order": "desc"
      }
    }
  ],
  "script_fields": {
    "type": {
      "script": {
        "lang": "painless",
        "source": "doc['_type']" <a id="CO331-4"></a><i class="conum" data-value="4"></i>
      }
    }
  }
}</pre>
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<div class="console_widget" data-snippet="snippets/741.console"></div>
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<p><a href="#CO331-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>Querying on the <code class="literal">_type</code> field</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO331-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>Aggregating on the <code class="literal">_type</code> field</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO331-3"><i class="conum" data-value="3"></i></a></p>
</td>
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<p>Sorting on the <code class="literal">_type</code> field</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO331-4"><i class="conum" data-value="4"></i></a></p>
</td>
<td align="left" valign="top">
<p>Accessing the <code class="literal">_type</code> field in scripts</p>
</td>
</tr>
</table>
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